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Submitted on: 20 July 2011.
Revised on: 24 August 2011.
Accepted on: 17 September 2011.
___________________Global Pediatric Health---SAGE PUBLICATIONS INC
Submitted on: 23 January 1998.
Revised on: 26 February 1998.
Accepted on: 10 March 1998.
___________________Global Pediatric Health---SAGE PUBLICATIONS INC